If you want 100MS/s sampling look at the 3205 rather than the 3204. The ADC200/100 is an older designed based around a parallel port interface. the 3204 is connected to and powered by a fast USB2.0 interface. This menas that no power supply is required and the screen update rate is also improved when using the large buffer memory. In short the 3204 is a better choice than the ADC200